基于背靠背变流器的微网并网功率和电压控制策略研究

Study on Power and Voltage Control Strategy of Microgrid Based on Back-to-Back Converter

提出了背靠背变流器用于公用电网和微电网之间的互连。基于两种控制模式以及背靠背变流器相对于传统的静态开关的长处,通过Matlab/Simulink仿真验证了其可行性。模式1为PQ控制模式,链路间变流器在微网中注入预定量的有功和无功功率。模式2为电压控制模式,尽管负载是非线性不平衡的,但背靠背变流器仍可以控制微电网的电压并其维持电能质量。

This paper proposes to use a back-to-back converter as the interlink between a utility grid and a microgrid.Based on the two control modes and the advantages of the back-to-back converter compared with the traditional static switch,the feasibility of this paper is proved by Matlab/Simulink simulation.In mode-1,the inter-link converter injects prespectifiedamounts of active and reactive power to the microgrid.This mode is identified as PQ control mode.Mode-2is the voltage control mode in which,the back-to-back converter controls the voltage of the microgrid and maintains the power quality of the current drawn from the utility grid in spite of nonlinear and unbalanced loads in the microgrid.